<template>
	<div>
		<!-- 面包屑导航区域 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>参数列表</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片视图区域 -->
		<el-card>
			<!-- 警告区域 -->
			<el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false"></el-alert>

			<!-- 选择商品分类区域 -->
			<el-row class="cat_opt">
				<el-col>
					<span>选择商品分类：</span>
					<!-- 选择商品分类的级联选择框 -->
					<el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="selectedCateKeys" @change="handleChange"></el-cascader>
				</el-col>
			</el-row>

			<!-- tab 页签区域 -->
			<el-tabs v-model="activeName" @tab-click="handleTabClick">
				<!-- 添加动态参数的面板 -->
				<el-tab-pane label="动态参数" name="many">
					<!-- 添加参数的按钮 -->
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
					<!-- 动态参数表格 -->
					<el-table :data="manyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 循环渲染Tag标签 -->
								<el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{ item }}</el-tag>
								<!-- 输入的文本框 -->
								<el-input
									class="input-new-tag"
									v-if="scope.row.inputVisible"
									v-model="scope.row.inputValue"
									ref="saveTagInput"
									size="small"
									@keyup.enter.native="handleInputConfirm(scope.row)"
									@blur="handleInputConfirm(scope.row)"
								></el-input>
								<!-- 添加按钮 -->
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column label="参数名称" prop="attr_name"></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
				<!-- 添加静态属性的面板 -->
				<el-tab-pane label="静态属性" name="only">
					<!-- 添加属性的按钮 -->
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
					<!-- 静态属性表格 -->
					<el-table :data="onlyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 循环渲染Tag标签 -->
								<el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{ item }}</el-tag>
								<!-- 输入的文本框 -->
								<el-input
									class="input-new-tag"
									v-if="scope.row.inputVisible"
									v-model="scope.row.inputValue"
									ref="saveTagInput"
									size="small"
									@keyup.enter.native="handleInputConfirm(scope.row)"
									@blur="handleInputConfirm(scope.row)"
								></el-input>
								<!-- 添加按钮 -->
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column label="属性名称" prop="attr_name"></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
			</el-tabs>
		</el-card>

		<!-- 添加参数的对话框 -->
		<el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
			<!-- 添加参数的对话框 -->
			<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
				<el-form-item :label="titleText" prop="attr_name"><el-input v-model="addForm.attr_name"></el-input></el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="addDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="addParams">确 定</el-button>
			</span>
		</el-dialog>

		<!-- 修改参数的对话框 -->
		<el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
			<!-- 添加参数的对话框 -->
			<el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
				<el-form-item :label="titleText" prop="attr_name"><el-input v-model="editForm.attr_name"></el-input></el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="editDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="editParams">确 定</el-button>
			</span>
		</el-dialog>
	</div>
</template>

<script>
export default {
	data() {
		return {
			// 商品分类列表
			catelist: [],
			// 级联选择框的配置对象
			cateProps: {
				value: 'cat_id',
				label: 'cat_name',
				children: 'children'
			},
			// 级联选择框双向绑定到的数组
			selectedCateKeys: [],
			activeName: 'many',
		
			manyTableData: [],
		
			onlyTableData: [],
		
			addDialogVisible: false,
	
			addForm: {
				attr_name: ''
			},
		
			addFormRules: {
				attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
			},
		
			editDialogVisible: false,
		
			editForm: {},
			
			editFormRules: {
				attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
			}
		};
	},
	created() {
		this.getCateList();
	},
	methods: {
		// 获取所有的商品分类列表
		async getCateList() {
			const { data: res } = await this.$http.get('categories');
			if (res.meta.status !== 200) {
				return this.$message.error('获取商品分类失败！');
			}

			this.catelist = res.data;

			console.log(this.catelist);
		},
		// 级联选择框选中项变化，会触发这个函数
		handleChange() {
			this.getParamsData();
		},
		// tab 页签点击事件的处理函数
		handleTabClick() {
			console.log(this.activeName);
			this.getParamsData();
		},
		// 获取参数的列表数据
		async getParamsData() {
			// 证明选中的不是三级分类
			if (this.selectedCateKeys.length !== 3) {
				this.selectedCateKeys = [];
				this.manyTableData = [];
				this.onlyTableData = [];
				return;
			}

			// 证明选中的是三级分类
			console.log(this.selectedCateKeys);
			// 根据所选分类的Id，和当前所处的面板，获取对应的参数
			const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
				params: { sel: this.activeName }
			});

			if (res.meta.status !== 200) {
				return this.$message.error('获取参数列表失败！');
			}

			res.data.forEach(item => {
				item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
				// 控制文本框的显示与隐藏
				item.inputVisible = false;
				// 文本框中输入的值
				item.inputValue = '';
			});

			console.log(res.data);
			if (this.activeName === 'many') {
				this.manyTableData = res.data;
			} else {
				this.onlyTableData = res.data;
			}
		},
		// 监听添加对话框的关闭事件
		addDialogClosed() {
			this.$refs.addFormRef.resetFields();
		},
		// 点击按钮，添加参数
		// 添加按钮，点击参数
		addParams() {
			this.$refs.addFormRef.validate(async valid => {
				if (!valid) return;
				const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
					attr_name: this.addForm.attr_name,
					attr_sel: this.activeName
				});

				if (res.meta.status !== 201) {
					return this.$message.error('添加参数失败！');
				}

				this.$message.success('添加参数成功！');
				this.addDialogVisible = false;
				this.getParamsData();
			});
		},
		// 点击按钮，展示修改的对话框
		async showEditDialog(attr_id) {
			// 查询当前参数的信息
			const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
				params: { attr_sel: this.activeName }
			});

			if (res.meta.status !== 200) {
				return this.$message.error('获取参数信息失败！');
			}

			this.editForm = res.data;
			this.editDialogVisible = true;
		},
		// 重置修改的表单
		editDialogClosed() {
			this.$refs.editFormRef.resetFields();
		},
		// 点击按钮，修改参数信息
		editParams() {
			this.$refs.editFormRef.validate(async valid => {
				if (!valid) return;
				const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
					attr_name: this.editForm.attr_name,
					attr_sel: this.activeName
				});

				if (res.meta.status !== 200) {
					return this.$message.error('修改参数失败！');
				}

				this.$message.success('修改参数成功！');
				this.getParamsData();
				this.editDialogVisible = false;
			});
		},
		// 根据Id删除对应的参数项
		async removeParams(attr_id) {
			const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
				confirmButtonText: '确定',
				cancelButtonText: '取消',
				type: 'warning'
			}).catch(err => err);

			// 用户取消了删除的操作
			if (confirmResult !== 'confirm') {
				return this.$message.info('已取消删除！');
			}

			// 删除的业务逻辑
			const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`);

			if (res.meta.status !== 200) {
				return this.$message.error('删除参数失败！');
			}

			this.$message.success('删除参数成功！');
			this.getParamsData();
		},
		async handleInputConfirm(row) {
			if (row.inputValue.trim().length === 0) {
				row.inputValue = '';
				row.inputVisible = false;
				return;
			}
			row.attr_vals.push(row.inputValue.trim());
			row.inputValue = '';
			row.inputVisible = false;
			this.saveAttrVals(row);
		},
		async saveAttrVals(row) {
				const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
				attr_name: row.attr_name,
				attr_sel: row.attr_sel,
				attr_vals: row.attr_vals.join(' ')
			});

			if (res.meta.status !== 200) {
				return this.$message.error('修改参数项失败！');
			}

			this.$message.success('修改参数项成功！');
		},
		showInput(row) {
			row.inputVisible = true;
				this.$nextTick(() => {
				this.$refs.saveTagInput.$refs.input.focus();
			});
		},
		handleClose(i, row) {
			row.attr_vals.splice(i, 1);
			this.saveAttrVals(row);
		}
	},
	computed: {
		isBtnDisabled() {
			if (this.selectedCateKeys.length !== 3) {
				return true;
			}
			return false;
		},
		cateId() {
			if (this.selectedCateKeys.length === 3) {
				return this.selectedCateKeys[2];
			}
			return null;
		},
		titleText() {
			if (this.activeName === 'many') {
				return '动态参数';
			}
			return '静态属性';
		}
	}
};
</script>

<style lang="scss" scoped>
.cat_opt {
	margin: 15px 0;
}

.el-tag {
	margin: 10px;
}

.input-new-tag {
	width: 120px;
}
</style>
